[....]I also don't know for sure whether the VAR decision for the goal scored by Garnacho was correct or not because after that incident it was Arsenal who managed to turn things around.
What are you trying to say here? Arsenal's last two goals has nothing to do with the disallowed MU goal. If you have a problem with the call then point it out on a technical level and not come of as someone saying MU was robbed of that goal so Arsenal could win. Garnacho was offside by the slightest of margins.
I'm just curious because quite a lot of people are discussing the VAR result and if it was offside then it was the right decision to annul the goal. I do not side with any team and all decisions remain in the hands of the referee. It seems like you are too hasty to define other people's opinions and when everything is clear there should be no need for too serious a debate. Well, whatever it is, Arsenal has done their job well and for Manchester United they have to try even harder so they can win the next match.
Just follow what decision has already been taken by VAR team and referee. Even though if it was not offside and it has already happened, you can't roll it back again. It's a common thing when see the loser say nay but the winner said yay to the decision taken by the referee and var team. Blaming the decision from the referee will be only wasting its time. The better thing for MU is to fix the problem owned by the club like trying to take care of its defender. The second goal comes from the defender's mistake.
Just let it flow. MU must try to prepare itself for the upcoming match. keep debating about VAR is pretty much useless at this moment.